Telephone-transmitter.



12.1. HOLMES 11 E. 1011113011.

TELEPHONE TRANSMITTER.

APPLICATION FILED JUNE 26. l9l6.

1,285,204. Patented July 31, 1917.

112 El w 1 4 @111 I UNITED STATES PATENT @FFICE.

EMIL L. HOLMES AND EDNARD JOHNSON, OF JAMESTOWN, NEW YORK.

TELEPHONE-TRANSMITTER.

Application filed. June 26, 1916.

To all whom it may concern.

Be it known that we, EMIL L. HOLMES and EDWARD JOHNSON, citizens of the United States, residing at the city of Jamestown, in the county of Chautauqua and State of New York, have invented certain new and useful Improvements in Telephone-Transmitters, of which the following, taken in connection with the accompanying drawings, is a specification.

The invention relates to means for stopping the resonating vibration of the transmitter diaphragm of telephones at the will of the operator; and the object of the improvement is to provide a deadening means for the entire telephone transmitter diaphragm operable from any point peripherally of the mouth piece so that all parts of said diaphragm will be held from vibration thereby eliminating the objectionable sounds ordinarily resonated; and the invention consists in the novel features and combinations hereinafter set forth and claimed.

In the drawings, Figure 1 is a sectional view of the telephone transmitter and mouth piece at line X X in Fig. 4, showing the telephone transmitter diaphragm deadener in the open or non-deadening position; and Fig. 2 is a similar view at line Y Y in Fig. 4, showing the telephone transmitter diaphragm deadener in the closed or deadening position so that no vibrations can take place in said diaphragm. Fig. 3 is a side elevation of the mouth piece removed from the transmitter head showing the operating ring around said mouth piece broken away to show the pin and slot connection to the tubular deadener, also the inner end of the deadener for the transmitter diaphragm. Fig. 4 is a plan view of the inner end of the mouth piece showing the tubular form of the deadener.

Like characters of reference refer to corresponding parts in the several views.

The numeral 10 designates the head or casing of the transmitter and the numeral 11 the diaphragm mounted therewithin with suitable electrical connection. The numeral 12 designates the mouth piece which is screwed into the telephone transmitter head.

The deadener for .the transmitter diaphragm 11 is mounted on the mouth piece 12 and consists of the ring 13 which encircles the outer periphery of the mouth piece near the transmitter head 10. The ring 13 is connected to an inner tube or deadener 14 by Specification of Letters Patent.

Patented July 31, 1917.

Serial No. 105,784.

means of a plurality of pins 15, preferably four, which are placed at spaced distances from one another around the mouth piece 12 and reciprocally work in slots 16. The inner tube 14 has the felted inner end to press against the diaphragm 11. A crosswise pin 17 is provided in the mouth piece 12 above the outer end of the tube 14, and a second crosswise pin 18 is provided in the tube 14 a spaced distance from the pin 17. A coil spring 19 connects these two pins midway of their length so that when in the normal position, as shown in Fig. 1, the coil spring 19 is at only sufficient tension to hold the tube or deadener 14 firmly in position away from the diaphragm 11. In order to use the deadener or tube 14 it is pressed downward by manual pressure on ring 13 onto the diaphragm around its central portion bearing firmly and evenly against said diaphragm. This pressure elongates the coil spring 19, as shown in Fig. 2, holding it at a tension, so that as soon as the ring 13 is released the tube 14 or deadener will spring back into its normal position out of touch or contact with the diaphragm 11.

It is apparent that the even pressure of the continuous ring or tube 14 with its felted inner end against the diaphragm 11 will hold all portions of the diaphragm against resonating vibration, and that the diaphragm 11 can thus be held from recording any conversation or noise in the room, as in factories where it would be impossible to hear a conversation over the telephone if the noise surrounding the telephone were not shut out by the user. The ring 13 is preferred because it is usable on all sides of the mouth piece 12 and bears firmly with balanced pressure upon the tube 14 from all sides of said mouth piece and is easily operable by the hand of the user of the telephone.

We claim as new 1. In combination with a telephone transmitter, a ring in the mouth piece engageable with the diaphragm, a pin extending diametrically across the ring, a second pin rigidly connected to the diaphragm, a coil spring connected at its ends to the centers of the pins, said mouth piece being longitudinally slotted, radial pins on said ring slidable in said slots, and an operating ring completely surrounding the mouth piece and slidable thereon and connected to said radial pins.

2. In combination with a telephone transmitter, and a spring pressed deadener for the diaphragm therein, a ring completely surrounding the transmitter mouth piece so as to be operable at any point peripherally of 5 said mouth piece, and means connecting the ring and deadener.

3. In combination with a telephone transmitter and a spring pressed deadener for the diaphragm, a slidable ring surrounding the 1.0 mouth piece so as to be operable at any point peripherally of the latter, the mouth piece having longitudinal slots parallel to its longitudinal axis, and connections between the ring and deadener extending through said slots, said ring extending over the slots. 15

In testimony whereof We have ailixed our signatures in the presence of tWo Witnesses.

EMIL L. HOLMES. EDWARD JOHNSON. i Vitnesses H. A. SANDBURG, A. .W. KETTLE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. O. 

